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A024700 a(n) = (-1 + p^2)/3, where p = p(n+2). 1
8, 16, 40, 56, 96, 120, 176, 280, 320, 456, 560, 616, 736, 936, 1160, 1240, 1496, 1680, 1776, 2080, 2296, 2640, 3136, 3400, 3536, 3816, 3960, 4256, 5376, 5720, 6256, 6440, 7400, 7600, 8216, 8856, 9296, 9976, 10680, 10920, 12160, 12416, 12936, 13200, 14840, 16576, 17176 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..47.

MATHEMATICA

f[n_]:=(Prime[n]^2-1)/3; lst={}; Do[a=f[n]; If[IntegerQ[a], AppendTo[lst, a]], {n, 2, 5!}]; lst [From Vladimir Joseph Stephan Orlovsky, Oct 17 2009]

CROSSREFS

Sequence in context: A057584 A063526 A156331 * A108576 A052207 A038578

Adjacent sequences:  A024697 A024698 A024699 * A024701 A024702 A024703

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified May 20 05:25 EDT 2013. Contains 225448 sequences.